The knife attacks in Hulumale was drug related as one attacked was a Chinese guy. The government tries to downplay the drug side in Maldives.
It's a country without any firearms. Not even a pellet gun is allowed into the country. Not even a plastic replica gun is allowed.
Sri Lanka is full of arms and even heavy arms and assault rifles around too. A terrorism related attack like in Sri Lanka has never happened in Maldives and I don't think will happen either because everyone knows it's the economy.
There is fundamentalist in Maldives too. You can see the Niqab etc to some extent. The ridiculous thing is in Maldives everyone knows everyone and they all know who the leaders of the fundamentalists are and that keeps everything in order. Most of the violence if there is happens in Male and it's political and now with the new elections in 2018 everything has calmed down.
The airport is very secure and for tourists it's safe. Most of the resorts have their own security experts who have law enforcement background and are always doing risk assessments and liaising with the local law enforcement agencies.